WO2009113416A1 - Communication system, transmission device, and reception device - Google Patents

Communication system, transmission device, and reception device Download PDF

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Publication number
WO2009113416A1
WO2009113416A1 PCT/JP2009/053809 JP2009053809W WO2009113416A1 WO 2009113416 A1 WO2009113416 A1 WO 2009113416A1 JP 2009053809 W JP2009053809 W JP 2009053809W WO 2009113416 A1 WO2009113416 A1 WO 2009113416A1
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WO
WIPO (PCT)
Prior art keywords
image
display
synchronization signal
frame
unit
Prior art date
Application number
PCT/JP2009/053809
Other languages
French (fr)
Japanese (ja)
Inventor
藤男 奥村
石橋 修
雅雄 今井
Original Assignee
日本電気株式会社
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Publication date
Priority to JP2008059969 priority Critical
Priority to JP2008-059969 priority
Application filed by 日本電気株式会社 filed Critical 日本電気株式会社
Publication of WO2009113416A1 publication Critical patent/WO2009113416A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/08Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00General purpose image data processing
    • G06T1/0021Image watermarking
    • G06T1/0085Time domain based watermarking, e.g. watermarks spread over several images
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41Structure of client; Structure of client peripherals
    • H04N21/414Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
    • H04N21/41415Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance involving a public display, viewable by several users in a public space outside their home, e.g. movie theatre, information kiosk
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/025Systems for the transmission of digital non-picture data, e.g. of text during the active part of a television frame
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14Digital output to display device; Cooperation and interconnection of the display device with other functional units
    • G06F3/147Digital output to display device; Cooperation and interconnection of the display device with other functional units using display panels
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2201/00General purpose image data processing
    • G06T2201/005Image watermarking
    • G06T2201/0051Embedding of the watermark in the spatial domain
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2358/00Arrangements for display data security
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2380/00Specific applications
    • G09G2380/06Remotely controlled electronic signs other than labels
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/12Synchronisation between the display unit and other units, e.g. other display units, video-disc players

Abstract

A transmission device displays a public image (a first image) provided to unspecified users, a secret image (a second image) provided to particular users, and a reversed image of the secret image by time division; and transmits a secret image synchronization signal synchronized with display of the secret image. A reception device receives the secret image synchronization signal transmitted from the transmission device and causes an imaging unit to capture the secret image displayed on the transmission device by using the secret image synchronization signal, for display on a display unit.

Description

COMMUNICATION SYSTEM, TRANSMISSION DEVICE, AND RECEPTION DEVICE

The present invention relates to a communication system for transmitting information by an image or a moving image displayed on a display or the like, and a transmission device and a reception device used in the communication system.

As a visible light communication technique for transmitting information by an image or a moving image displayed on a display or the like, a specific two-dimensional code (QR code) or the like is displayed on a part of the display image, and the two-dimensional image is displayed by a camera such as a mobile phone. Systems are known in which a code is imaged and information is received.

For example, in Japanese Patent Application Laid-Open No. 2007-163233, when an abnormality is detected in a vehicle navigation system, failure diagnosis data including an abnormality signal indicating the abnormality is generated, and the failure diagnosis data is represented by a symbol code (barcode or two-dimensional). A configuration is described in which failure diagnosis data can be visually recognized by a user reading the displayed symbol code with a portable terminal device.

Japanese Laid-Open Patent Publication No. 2006-020204 discloses a server device specified by information of a read two-dimensional code, which reads a two-dimensional code printed on a display medium with a terminal device and provides contents such as an image and sound. A configuration is described in which various contents are acquired by accessing the.

However, in the visible light communication technology of the background art as described above, when a two-dimensional code is displayed on, for example, a large display used on a street, an image such as an advertisement (public image) in which the two-dimensional code is displayed to the public. ) To occupy a part of the aesthetics.

Therefore, an object of the present invention is to provide a communication system capable of visible light communication by simple means without impairing the beauty of public images, and a transmission device and a reception device used in the communication system.

In order to achieve the above object, the communication system of the present invention outputs an image signal for displaying a first image, a second image, and an inverted image of the second image in a time-sharing manner, and the second image. A transmission device for transmitting a second image synchronization signal synchronized with the display of the image of
A display device for displaying an image based on the image signal output from the transmission device;
A receiver that receives the second image synchronization signal, and that captures the second image displayed on the transmitter using the second image synchronization signal, by the imaging unit;
Have

On the other hand, the transmission device of the present invention includes a display unit that displays a first image, a second image, and an inverted image of the second image;
A control unit for displaying the first image, the second image, and the inverted image on the display unit in a time-sharing manner;
A synchronization signal generator for transmitting a second image synchronization signal synchronized with the display of the second image;
Have

Further, the receiving device of the present invention receives a second image synchronization signal that is transmitted from the transmission device and is synchronized with the display of the second image, and based on the received second image synchronization signal, A synchronization signal processing unit for instructing the shooting timing of the second image;
An imaging unit that captures the second image according to an instruction from the synchronization signal processing unit;
A display unit for displaying the second image photographed by the photographing unit;
Have

FIG. 1A is a schematic diagram illustrating a configuration example of a communication system according to the first embodiment. 1B is a schematic diagram illustrating a configuration example of a network system using the communication system illustrated in FIG. 1A. FIG. 2 is a block diagram illustrating a configuration example of the display device and the transmission device illustrated in FIG. 1A. FIG. 3 is a block diagram illustrating a configuration example of the receiving apparatus illustrated in FIG. 1A. FIG. 4 is a schematic diagram illustrating an operation example of the transmission apparatus according to the first embodiment. FIG. 5 is a schematic diagram illustrating an operation example of a transmission device and an optical shutter used in the secure display technology. FIG. 6 is a schematic diagram illustrating an operation example of the transmission apparatus according to the second embodiment. FIG. 7 is a schematic diagram illustrating another operation example of the transmission apparatus according to the second embodiment. FIG. 8 is a schematic diagram illustrating an operation example of the transmission apparatus according to the third embodiment. FIG. 9 is a diagram illustrating another operation example of the transmission apparatus according to the third embodiment. FIG. 9A illustrates an operation example in which flicker is easily perceived, and FIG. 9B illustrates an operation in which flicker is difficult to perceive. It is a schematic diagram which shows an example. FIG. 10 is a schematic diagram illustrating an operation example of the receiving apparatus according to the fourth embodiment.

Next, the present invention will be described with reference to the drawings.

As a method for dealing with the problems of the background art described above, for example, a display device that displays a public image and an image (secret image) provided only to a specific user in a time-sharing manner, and a light that is synchronized with the display timing of the secret image. There is so-called secure display technology in combination with an optical shutter that transmits light.

In the secure display technology, a public image provided to an unspecified person by a display device, a secret image provided only to a specific user, and an inverted image of the secret image are displayed in a time-sharing manner within one frame, and the user The optical shutter existing in front of is switched to the transmission state in synchronization with the display timing of the secret image. As a result, only the secret image is visually recognized by the user who uses the optical shutter, and the secret image is superimposed on the inverted image to a non-specific person (public) who does not use the optical shutter to create a halftone (gray) image. Therefore, only the public image is visually recognized. The “first image” recited in the claims corresponds to the public image, and the “second image” corresponds to the secret image.

By using this secure display technology, it is possible to provide various information using a secret image to a user having an optical shutter while providing a public image to an unspecified person. Therefore, the beauty of public images is not impaired.

However, in the secure display technology, as described above, an optical shutter is required to visually recognize the secret image, so that users who provide the secret image are limited. In general visible light communication, it is desirable to be able to provide various information (contents) to a large number of users with a secret image more easily.

For example, when displaying a URL (Uniform Resource Locator) of a server device that displays detailed information about a product displayed as a public image by a public image and provides a detailed image of the product displayed as a secret image with a two-dimensional code, etc. If the two-dimensional code can be acquired without using it, it is preferable for the convenience of the user to improve.

Therefore, the present invention proposes a method that can easily provide various contents to a large number of users using a secret image by using this secure display technology. In the following, like the secure display technology, an image such as an advertisement provided to an unspecified person is referred to as a public image, and an image provided only to a specific user is referred to as a secret image.
(First embodiment)
FIG. 1A is a schematic diagram illustrating a configuration example of a communication system according to the first embodiment, and FIG. 1B is a schematic diagram illustrating a configuration example of a network system using the communication system illustrated in FIG. 1A.

As illustrated in FIG. 1A, the communication system according to the first embodiment includes a display device 1 that displays a public image, a secret image, and a reverse image thereof in a time-sharing manner, and an image for causing the display device 1 to display each image. Transmitting device 3 that outputs a signal, receiving device 2 owned by a user that acquires a public image or a secret image from an image displayed on display device 1, and various types of receiving device 2 via known communication means The configuration includes a data server 4 installed in the vicinity of the display device 1 or the transmission device 3 for transmitting content data.

As shown in FIG. 1A, a user who uses the communication system of the present embodiment points a camera (not shown) included in the receiving device 2 toward the display image of the display device 1 and is displayed on the display unit of the receiving device 2. The public image is photographed while visually recognizing the public image. The image captured at this time may be the entire public image or a part of the public image. By such an operation, the user can display the public image or a part of the image (for example, a product displayed as an advertisement) on the receiving device 2 and receive the secret image corresponding to the shooting position of the public image. It can be displayed on the device 2. Further, the user can acquire various contents provided by using the secret image by the receiving device 2. For example, when the secret image acquired by the receiving device 2 is access data to the data server 4 using a two-dimensional code or the like, by transmitting / receiving information to / from the data server 4 based on the access data, the data server 4 Data of various contents can be acquired.

In the communication system shown in FIG. 1A, since it is assumed that various contents are provided to the user using a secret image, a configuration including a data server 4 that transmits data of the contents to the receiving device 2 However, the data server 4 is not necessarily required, and may not be provided when only the secret image is provided.

As shown in FIG. 1B, the communication system shown in FIG. 1A can realize a network system that provides users with various contents and information services by connecting to a network such as the Internet.

In such a network system, when the secret image is URL data using, for example, a two-dimensional code, the user decodes the two-dimensional code by the receiving device 2 to acquire the URL, and a network such as the Internet The data of various contents can be acquired from the server device (Web site) designated by the URL via the URL.

In addition, when the secret image is, for example, a moving image, the user can acquire video information such as a video clip using the receiving device 2, and audio information (two-dimensional code or the like displayed) (Including music etc.).

Furthermore, if the confidentiality of the secret image is used, various information services such as online purchase of goods, settlement processing, and stock transactions can be provided to the user.

Hereinafter, specific examples of the display device 1, the transmission device 3, and the reception device 2 constituting the communication system illustrated in FIG. 1A and the network system illustrated in FIG. 1B will be described with reference to the drawings.

FIG. 2 is a block diagram showing a configuration example of the display device and the transmission device shown in FIG. 1A, and FIG. 3 is a block diagram showing a configuration example of the reception device shown in FIG. 1A.

As shown in FIG. 2, the transmission apparatus 3 includes a level detection unit 11, a first luminance modulation unit 12, a second luminance modulation unit 13, an inverted image generation unit 14, a selector 15, a synchronization signal generation unit 16, and a control unit. The display device 1 includes a video memory 17 and a display unit 19.

The level detection unit 11 detects the luminance (image signal level) of the public image and notifies the first luminance modulation unit 12 and the second luminance modulation unit 13 of the detection result.

The first luminance modulation unit 12 changes the luminance (image signal level) of the public image as necessary based on the detection result of the level detection unit 11.

The second luminance modulation unit 13 changes the luminance (image signal level) of the secret image as necessary based on the detection result of the level detection unit 11.

The inverted image generation unit 14 generates an image signal corresponding to the inverted image using the image signal of the secret image after the level change by the second luminance modulation unit 13. As an image signal of the inverted image, for example, when the image signal level of the secret image is set to the positive direction, an image signal having the same absolute value as that of the secret image and the image signal level of the negative direction is generated. do it.

The selector 15 selects the image signal of the public image output from the first luminance modulation unit 12, the image signal of the secret image output from the second luminance modulation unit 13, or the reverse image generated by the reverse image generation unit 14. The image signals are switched in accordance with instructions from the control unit 18 and are sequentially output to the video memory 17.

The synchronization signal generator 16 generates and transmits a public image synchronization signal synchronized with the display start and display end of the public image and a secret image synchronization signal synchronized with the display start and display end of the secret image.

The control unit 18 controls the operations of the selector 15 and the synchronization signal generating unit 16 in accordance with the frame configuration of the image displayed on the display unit 19.

The video memory 17 sequentially holds the image signal of the public image, the secret image or the reverse image selected by the selector 15 as image data. Note that the video memory 17 may be provided not in the display device 1 but in the transmission device 3.

The display unit 19 sequentially displays a public image, a secret image, or a reverse image according to the image data stored in the video memory 17.

The transmission device 3 shown in FIG. 2 can be realized by an A / D converter for processing an image signal, a CPU, a DSP, a logical operation circuit, or the like that executes processing according to a program. The display device 1 may be a liquid crystal display, an LED display, a DLP type projector device, an organic EL display, a PDP, or the like.

As illustrated in FIG. 3, the reception device 2 includes an imaging unit 21, a synchronization signal processing unit 22, a multiplier distributor 23, an embedded signal processing unit 24, a video memory 25, a display unit 26, a transmission / reception unit 27, and a control unit 28. The sound signal processing unit 29 and the communication unit 30 are provided.

The photographing unit 21 includes a camera, photographs an image displayed on the display unit 19 of the display device 1 in accordance with an instruction from the synchronization signal processing unit 22, and outputs the image to the multiplier / distributor 23.

The synchronization signal processing unit 22 includes a receiving unit that receives the public image synchronization signal and the secret image synchronization signal transmitted from the transmission device 3, and captures images based on the received public image synchronization signal and secret image synchronization signal. The unit 21 is instructed to shoot the public image or the secret image, and outputs the public image synchronization signal or the secret image synchronization signal to the multiplier distributor 23.

The public image synchronization signal and the secret image synchronization signal are obtained by using an optical communication means using infrared rays or a known short-range wireless communication means such as Bluetooth, UWB, ZigBee, etc. 16 to the synchronization signal processing unit 22 included in the receiving device 2.

The multiplier distributor 23 changes the luminance (image signal level) of the image signal of the public image or secret image output from the photographing unit 21 and distributes it to the video memory 25 and the embedded signal processing unit 24.

The video memory 25 stores the image signal output from the multiplier distributor 23 or the control unit 28 as image data.

The display unit 26 displays a public image or a secret image according to the image data stored in the video memory 25.

The embedded signal processing unit 24 performs necessary signal processing on the image signal of the secret image acquired by the imaging unit 21. For example, when the secret image photographed by the photographing unit 21 is a two-dimensional code, the embedded signal processing unit 24 decodes the two-dimensional code. The signal processing result of the embedded signal processing unit 24 is output to the control unit 28.

Based on the signal processing result of the embedded signal processing unit 24, the control unit 28 uses the transmission / reception unit 27 and the communication unit 30 to transmit voice (including music) data, character data, image data, Various content data such as moving image data is acquired. For example, when the URL is acquired based on the signal processing result of the embedded signal processing unit 24, the control unit 28 acquires various content data from a server device or the like in the network specified by the URL using the communication unit 30. When the access data to the data server 4 is acquired as a result of the signal processing of the embedded signal processing unit 24, various content data are acquired from the data server 4 using the transmission / reception unit 27. The acquired sound data is output to the sound signal processing unit 29, and character data, image data, moving image data, and the like are stored in the video memory 25 as image data.

The sound signal processing unit 29 includes an amplifier that amplifies an audio signal, a speaker that outputs audio, and the like, converts audio data supplied from the control unit 28 into an audio signal, and outputs audio through the speaker.

The transmitting / receiving unit 27 is communicably connected to the data server 4 and receives various content data from the data server 4 in accordance with instructions from the control unit 28. The transmission / reception unit 27 and the data server 4 may transmit and receive various types of content data using optical communication means using infrared rays or the like, or well-known short-range wireless communication means such as Bluetooth, UWB, ZigBee.

The communication unit 30 is communicably connected to a network such as the Internet by a known wireless communication unit, and receives various content data from a server device or the like specified by a URL in the network according to an instruction from the control unit 28.

The receiving device 2 includes a mobile phone and a PDA (Personal Digital Assistant) equipped with a camera for taking an image and a receiving device for receiving the public image synchronization signal and the secret image synchronization signal transmitted from the transmission device 3. Alternatively, a portable terminal device such as a notebook personal computer is used.

Next, the operation of the transmission device 3 according to the first embodiment will be described with reference to the drawings.

FIG. 4 is a schematic diagram illustrating an operation example of the transmission apparatus according to the first embodiment.

As shown in FIG. 4, the transmission apparatus 3 according to the first embodiment displays a public image, a secret image, and an inverted image in a time-division manner within one frame, as in the above-described secure display technology. The display order of public images, secret images, and reverse images within one frame is arbitrary. The synchronization signal generator 16 transmits a public image synchronization signal synchronized with the display start and display end of the public image, and a secret image synchronization signal synchronized with the display start and display end of the secret image.

The receiving device 2 receives the public image synchronization signal and the secret image synchronization signal by the synchronization signal processing unit 22, respectively, and captures and displays the public image or the secret image at the position specified by the user's operation by the imaging unit 21. Displayed on the unit 26. The secret image does not necessarily have to be displayed on the display unit 26. Instead of the secret image, the secret image is acquired from the network or the data server 4 based on the signal processing result of the embedded signal processing unit 24 or the signal processing result. Various kinds of content data may be displayed. In this case, the receiving device 2 displays the secret image on the display unit 26 for a time that allows the user to confirm the secret image, and then obtains the result of signal processing of the embedded signal processing unit 24 or the network or the data server 4. Various content data may be displayed.

Generally, an image sensor such as a CCD (Charge Coupled Devices) or a CMOS is used for a camera included in a mobile terminal device used as the receiving device 2. In the photographing unit 21 using these image pickup elements, in general, in order to reduce noise and improve light reception sensitivity, charges generated in the CCD and CMOS according to the amount of received light are integrated for a certain period (for example, one frame period). Operate in accumulation mode. Therefore, if the display period of the public image or the secret image is not detected by any means, the photographing unit 21 outputs a composite image of the public image and the secret image.

The receiving device 2 of the present embodiment uses the public image synchronization signal and the secret image synchronization signal transmitted from the transmission device 3 to detect the start and end of the integration period when the required public image or secret image is captured. To do. Therefore, the receiving device 2 can shoot the public image and the secret image at the position designated by the user operation without being combined by the shooting unit 21. Further, in the receiving apparatus 2 of the present embodiment, since the secret image is captured using the secret image synchronization signal, the image quality of the secret image is deteriorated by combining the secret image and the inverted image, that is, for visible light communication. Deterioration of the signal level used is prevented.

According to the communication system of the first embodiment, visible light communication can be performed by simple means without impairing the beauty of public images.

In the secure display technology described above, since a liquid crystal is used as an optical shutter, a period (blank) in which nothing is displayed is provided between the public image and the secret image and between the secret image and the reverse image as shown in FIG. There is a need. This blank requires a certain amount of time when the liquid crystal is switched from the non-transmissive state to the transmissive state or from the transmissive state to the non-transmissive state. It is provided to ensure that only the image is transmitted. Therefore, the secure display technology described above has a problem that the brightness of the secret image decreases.

On the other hand, in the communication system according to the present embodiment, since the public image or the secret image is captured and displayed by the imaging unit 21 provided in the receiving device 2, as shown in FIG. There is no need to provide a blank period between images. Therefore, a decrease in the brightness of the secret image is suppressed as compared with the above-described secure display technology.
(Second Embodiment)
FIG. 6 is a schematic diagram illustrating an operation example of the transmission apparatus according to the second embodiment.

The transmission device 3 according to the second embodiment sets the display period of the public image longer than the display period of the secret image and the reverse image. Specifically, as shown in FIG. 6, a frame for displaying only a public image (hereinafter referred to as a public image frame) is provided, and the public image, the secret image, and the reverse image shown in the first embodiment are time-divisionally divided. A frame to be displayed (hereinafter referred to as a secure frame) is periodically inserted between a plurality of consecutive public image frames. If the display period of the public image is set longer than the display period of the secret image or the reverse image in this way, the brightness of the public image displayed on the display device 1 is improved and the contrast is increased. Therefore, the image quality of the displayed public image is increased. Will improve.

For switching between public image frames and secure frames, the control unit 18 of the transmission device 3 may cause the selector 15 to select an optimal image signal in accordance with the frame configuration. In addition, the synchronization signal generator 16 of the transmission device 3 starts the display of the public image according to the frame configuration of the image displayed on the display device 1, and starts the display and display of the public image synchronization signal and the secret image synchronized with the display end. A secret image synchronization signal synchronized with the end may be transmitted. Since the configurations of the display device 1, the transmission device 3, and the reception device 2 and other operations are the same as those in the first embodiment, description thereof is omitted.

In the secure display technology described above, it is assumed that the user directly views the secret image through the optical shutter. Therefore, if a public image frame is simply provided when performing visible light communication, the brightness of the secret image decreases and visible light is displayed. There is a possibility that practical luminance cannot be obtained for communication. However, in the present invention, the secret image is directly photographed by the photographing unit 21 of the receiving device 2 without passing through the optical shutter, stored in the video memory 25 and displayed. Therefore, it is not necessary to consider a decrease in the brightness of the secret image unlike the secure display technology.

The secure frame may be provided every three frames as shown in FIG. 7 (a), or may be provided every four frames as shown in FIG. 7 (b). The configuration may be such that a secure frame is provided for each. As the number of public image frames is increased, the brightness of the public image is improved and the contrast of the public image is increased. However, when the number of public image frames is increased, the chance of acquiring the secret image is reduced. Therefore, if the update frequency of secret images is high (video display etc.) or if it is desired to reduce the time required to display the secret image on the receiving device 2, an upper limit is set for the number of increase of public image frames as necessary. It is preferable to do.

According to the present embodiment, in addition to the same effects as those of the first embodiment, the brightness of the public image displayed on the display device 1 is improved and the contrast is increased, so that the image quality of the displayed public image is improved. Can be made.
(Third embodiment)
FIG. 8 is a schematic diagram illustrating an operation example of the transmission apparatus according to the third embodiment. FIG. 9 is a diagram showing another operation example of the transmission apparatus according to the third embodiment. FIG. 9A shows an operation example in which flicker is easily perceived, and FIG. 9B shows that it is difficult to perceive flicker. It is a schematic diagram which shows an operation example. Since the configurations of the display device 1, the transmission device 3, and the reception device 2 and other operations are the same as those in the first embodiment and the second embodiment, description thereof is omitted.

In the above-described second embodiment, an example in which a secure frame is periodically inserted for each of a plurality of consecutive frames has been described. However, since the brightness of the public image differs between the public image frame and the secure frame due to the difference in display period, flickering of the public image occurs when the secure frame is periodically inserted into the image displayed on the display device 1. It becomes a factor.

In the third embodiment, secure frames are randomly inserted into a plurality of consecutive public image frames (see FIG. 8). By doing in this way, the flicker of the public image displayed on the display apparatus 1 is suppressed.

As in the second embodiment, the public image frame and the secure frame may be switched by causing the control unit 18 of the transmission device 3 to select the optimum image signal in accordance with the frame configuration. Further, the synchronization signal generation unit 16 of the transmission device 3 includes a public image synchronization signal synchronized with the display start and display end of the public image and a secret image synchronized with the display start and display end according to the frame configuration to be displayed. A synchronization signal may be transmitted. Since the configurations of the display device 1, the transmission device 3, and the reception device 2 and other operations are the same as those in the first embodiment, description thereof is omitted.

It should be noted that the following method is also effective as a method of suppressing the flicker of public images displayed on the display device 1.

As shown in FIG. 9A, when the public image frame (frame 1) and the secure frame (frame 2) are mixed, the image signal levels of the public image frame and the public image of the secure frame are equalized. Since the difference in luminance of public images in the image becomes large, flicker is easily perceived.

Therefore, as shown in FIG. 9B, the luminance of the public image for each frame is made the same by changing the image signal level of the public image of the public image frame and that of the secure frame. Specifically, the first luminance modulation unit 12 reduces the image signal level of the public image in the public image frame according to the ratio of the public image display period of the public image frame and the secure frame. Alternatively, the second luminance modulation unit 13 increases the image signal level of the public image in the secure frame according to the ratio of the display period of the public image frame and the public image of the secure frame. For example, when the display period of the public image frame is three times the display period of the public image of the secure frame, the first luminance modulation unit 12 sets the image signal level of the public image frame to 1/3. Alternatively, the second luminance modulation unit 13 triples the image signal level of the secret image frame. Also in these methods, flickering of public images displayed on the display device 1 is suppressed.

Note that making the brightness of the public image of the public image frame and the secure frame the same means that the peak value of the image signal level of the public image for each frame is the same, and the average value of the image signal level of the public image for each frame Are the same or a combination of these processes.

According to this embodiment, in addition to the same effects as those of the first embodiment and the second embodiment, flickering of public images displayed on the display device 1 is suppressed.
(Fourth embodiment)
In the fourth embodiment, a method for making the brightness of the public image and the secret image displayed on the display unit 26 of the receiving device 2 the same is proposed. Since the configurations of the display device 1, the transmission device 3, and the reception device 2 are the same as those in the first embodiment, description thereof is omitted.

FIG. 10 is a schematic diagram illustrating an operation example of the receiving apparatus according to the fourth embodiment.

As shown in FIG. 10A, when the display device 1 displays a mixture of public image frames and secure frames, the display of the public image is started and the display end of the public image from the synchronization signal generator 16 of the transmission device 3. When a public image synchronization signal that matches the timing is transmitted, the reception apparatus 2 obtains a public image and a secret image that have different brightness (luminance) because the integration period is different. Therefore, when the public image displayed on the display unit 26 of the receiving device 2 is switched to the secret image, the screen of the secret image is perceived as an image with a dark contrast and a low contrast.

In the receiving device 2 of the fourth embodiment, the multiplier / distributor 23 causes the luminance of the public image and the secret image displayed on the display unit 26 of the receiving device 2 according to the ratio of the display period of the public image and the secret image. The image signal level of the secret image acquired by the photographing unit 21 is increased so as to be the same. Alternatively, the image signal level of the public image acquired by the photographing unit 21 is lowered so that the brightness of the public image and the secret image displayed on the display unit 26 of the receiving device 2 are the same. For example, when it is detected that the display period of the public image is three times the display period of the secret image based on the public image synchronization signal and the secret image synchronization signal, the multiplier distributor 23 sets the image signal level of the secret image. Triple. Alternatively, the multiplier distributor 23 sets the image signal level of the public image to 1/3. In this way, since the brightness of the public image and the secret image becomes the same, the public image and the secret image are displayed on the display unit 26 of the receiving device 2 with the same brightness.

It should be noted that there are the following methods for making the brightness of the public image and the secret image displayed on the display unit 26 of the receiving device 2 the same.

As shown in FIG. 10B, in order to make the brightness of the public image and the secret image the same, the period from the display start of the public image synchronization signal generated by the synchronization signal generation unit 16 of the transmission device 3 to the display end is set. What is necessary is just to make it correspond to the display period (refer to 10 (c)) of a secret image. For example, when the display period of the public image by the display device 1 is three times the display period of the secret image, the period from the display start to the display end of the public image synchronization signal generated by the synchronization signal generator 16 is actually displayed. Set to 1/3 of the period.

In this way, since the integration period of the public image and the secret image in the photographing unit 21 of the receiving device 2 is the same, the public image and the secret image displayed on the display unit 26 of the receiving device 2 are displayed with the same brightness. Is done.

According to this embodiment, in addition to the same effects as those of the first embodiment, the public image and the secret image are displayed on the display unit 26 of the receiving device 2 with the same brightness.

Note that the same brightness of the public image and the secret image means that the peak value of the image signal level of the public image and the secret image is the same, and the average value of the image signal level of the public image and the secret image is the same. Or a combination of these processes.
(Fifth embodiment)
As described above, since the secure display technology is used in the present invention, the display device 1 displays a public image and a halftone (gray) image in which the secret image and its inverted image are superimposed. For this reason, when a dark (black) image is included in the public image, a so-called black float occurs in which the part feels brighter than the actual image. That is, the contrast of the public image displayed on the display device 1 is lowered.

In the fifth embodiment, when there is a dark part in the public image displayed on the display device 1, the transmission device 3 determines the main color and displays the corresponding blue or red secret image. The device 1 is displayed in a secure frame. For example, when the dark part in the public image is a strong blue image, the display device 1 displays the blue secret image and its reverse image on the corresponding part in the secure frame. In this way, since the halftone in which the secret image and the inverted image are superimposed in the corresponding part is blue, a decrease in contrast of the dark part in the public image is suppressed.

Also, when the dark part in the public image is a strong red image, the display device 1 displays the red secret image and its inverted image at the corresponding part in the secure frame. In this way, since the halftone in which the secret image and the inverted image are superimposed in the corresponding part is red, the decrease in contrast of the dark part in the public image is suppressed.

Furthermore, when there are a plurality of dark parts in the public image, and there are a part where a strong red image is displayed and a part where a strong blue image is displayed, the display device 1 has red or red at each corresponding part in the secure frame. A blue secret image and its reverse image are displayed. In this way, since the halftone in which the secret image and the reverse image are superimposed in the corresponding part is red or blue, a decrease in contrast of the dark part in the public image is suppressed.

However, in this embodiment, when a general color image is displayed as a secret image, the color of the secret image is not displayed correctly. Therefore, the secret image displayed in the present embodiment is preferably a coded image such as a two-dimensional code or a one-dimensional code. However, the secret image displayed in the present embodiment is not limited to the coded image, and any image can be used as long as it does not feel strange even if it includes a red or blue portion by the above processing. Such an image may be used.

Note that, as shown in the first to third embodiments, a secret image made up of a normal color image and its inverted image may be displayed in a secure frame at a bright part in a public image. .

Also, when the secret image and the reverse image are displayed in blue or red, blue or red is displayed stronger in the public image. Therefore, if the blue or red image signal level of the public image is lowered according to the halftone image signal level in which the secret image and the inverted image are superimposed, the secret image and the entire inverted image are displayed as a blue or red image. It is also possible to do.

In the transmission device 3 of the fifth embodiment, the level detection unit 11 shown in FIG. 2 detects the image signal level and color of a public image for each area of a predetermined size, and the detection result is obtained. The first luminance modulation unit 12 and the second luminance modulation unit 13 are notified. Based on the detection result of the level detection unit 11, the first luminance modulation unit 12 reduces and outputs the blue or red image signal level of the public image as necessary.

Based on the detection result of the level detection unit 11, the second luminance modulation unit 13 outputs an area of a predetermined size set in advance or converts the entire secret image into a blue or red image. Since the other configurations of the transmission device 3 and the configurations of the display device 1 and the reception device 2 are the same as those in the first embodiment, description thereof is omitted.

According to the present embodiment, in addition to the same effects as those of the first embodiment, even when a dark part is included in the public image displayed on the display device 1, a decrease in contrast is suppressed and the image quality is improved. Can be improved.

As mentioned above, although this invention was demonstrated with reference to embodiment, this invention is not limited to the said embodiment. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

This application claims priority based on Japanese Patent Application No. 2008-059969 filed on Mar. 10, 2008, the entire disclosure of which is incorporated herein.

Claims (17)

  1. Second image synchronization that outputs an image signal for displaying the first image, the second image, and an inverted image of the second image in a time-division manner, and is synchronized with the display of the second image A transmission device for transmitting a signal;
    A display device for displaying an image based on the image signal output from the transmission device;
    A receiver that receives the second image synchronization signal, and that captures the second image displayed on the transmitter using the second image synchronization signal, by the imaging unit;
    A communication system.
  2. The transmitter is
    Transmitting a first image synchronization signal synchronized with the display of the first image;
    The receiving device is:
    The first image synchronization signal is received, and the first image displayed on the display device is photographed by the photographing unit using the first image synchronization signal, and displayed on the display unit. The communication system described.
  3. The transmitter is
    The communication system according to claim 1 or 2, wherein a display period of the first image is set longer than a display period of the second image and the reverse image.
  4. The transmitter is
    Using the first image frame that displays only the first image and the second image frame that displays the first image, the second image, and the inverted image in a time-sharing manner, the first image frame is displayed. The communication system according to claim 3, wherein an image, the second image, and the inverted image are displayed.
  5. The transmitter is
    The communication system according to claim 4, wherein the second image frame is randomly inserted into the plurality of continuous first image frames.
  6. The transmitter is
    The first image frame and the second image frame so that the luminance of the first image of the first image frame and the luminance of the first image included in the second image frame are the same. The image signal level of the first image included in the first image frame or the image signal level of the first image included in the second image frame according to the ratio of the display period of the first image included in The communication system according to claim 4 to be changed.
  7. The transmitter is
    The communication system according to claim 1, wherein when the second image is an encoded image, the second image and the reverse image are displayed including a blue or red image.
  8. A display unit for displaying the first image, the second image, and a reverse image of the second image;
    A control unit for displaying the first image, the second image, and the inverted image on the display unit in a time-sharing manner;
    A synchronization signal generator for transmitting a second image synchronization signal synchronized with the display of the second image;
    A transmission device.
  9. The synchronization signal generator is
    A transmission device that transmits a first image synchronization signal synchronized with the display of the first image.
  10. The controller is
    The transmission device according to claim 8 or 9, wherein a display period of the first image is set longer than a display period of the second image and the reverse image.
  11. The controller is
    Using the first image frame that displays only the first image and the second image frame that displays the first image, the second image, and the inverted image in a time-sharing manner, The transmission device according to claim 10, wherein an image, the second image, and the inverted image are displayed on the display unit.
  12. The controller is
    The transmission device according to claim 11, wherein the second image frame is randomly inserted into the plurality of continuous first image frames.
  13. A level detection unit that detects the luminance of the first image of the first image frame and the luminance of the first image included in the second image frame;
    The first image frame and the second image frame so that the luminance of the first image of the first image frame and the luminance of the first image included in the second image frame are the same. The image signal level of the first image included in the first image frame or the image signal level of the first image included in the second image frame according to the ratio of the display period of the first image included in A first luminance modulation section to be changed;
    The transmission device according to claim 11, further comprising:
  14. 14. The transmission according to claim 13, further comprising a second luminance modulation unit for including a blue or red image in the second image and the inverted image when the second image is a coded image. apparatus.
  15. A second image synchronization signal synchronized with the display of the second image transmitted from the transmission device is received, and the shooting timing of the second image is determined based on the received second image synchronization signal. A synchronization signal processing unit for instructing;
    An imaging unit that captures the second image according to an instruction from the synchronization signal processing unit;
    A display unit for displaying the second image photographed by the photographing unit;
    A receiving apparatus.
  16. The synchronization signal processing unit
    The first image synchronization signal synchronized with the display of the first image transmitted from the transmission device is received, and the photographing timing of the first image is determined based on the received first image synchronization signal. Instruct the shooting unit,
    The photographing unit
    Taking the first image according to an instruction from the synchronization signal processing unit,
    The display unit
    The receiving device according to claim 15, wherein at least the first image captured by the imaging unit is displayed.
  17. The transmission apparatus displays a first image frame that displays only the first image, a second image frame that displays the first image, the second image, and an inverted image of the second image in a time-sharing manner. When the first image, the second image, and the reverse image are displayed using the image capturing unit, the photographing unit causes the luminance of the first image and the second image to be the same. The receiving device according to claim 15 or 16, further comprising a multiplier distributor for changing an image signal level of the photographed first image or an image signal level of the second image.
PCT/JP2009/053809 2008-03-10 2009-03-02 Communication system, transmission device, and reception device WO2009113416A1 (en)

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